@article {HasLan18,
	title = {Renormalization analysis for degenerate ground states},
	journal = {J. Funct. Anal.},
	volume = {275},
	number = {1},
	year = {2018},
	pages = {103{\textendash}148},
	issn = {0022-1236},
	doi = {10.1016/j.jfa.2018.03.005},
	url = {https://doi.org/10.1016/j.jfa.2018.03.005},
	author = {Hasler, David and Markus Lange}
}
